Knife-blade or reaping, mowing, and like machines.



J. SQUAIR. KNIFE BLADE 0F REAPING, MOWING, AND LIKE-MACHINES. APPLICATION FILED JULY 20, 1908.

922,058. Patented May 18, 1909.

WITNESSES. 0% 45 Y5 at 601M.

1n: NURRIS PETERS cm, WASHINGTOIV, u. c.

JAMES SQUAIR, OF BULAWAYO, RHODESIA.

KNIFE-BLADE OF REAPING, MOWING, AND LIKE MACHINES.

Specification of Letters Patent.

Patented May 18, 1909.

Application filed July 20, 1908. Serial No. 444,563.

To all whom it may concern:

Be it known that I, JAMES SQUAIR, a sub ject of the King of Great Britain and Ireland,

This invention relates to the knife blades of reapin mowing and like machines and particular y to blades having serrations on their under sides adjacent .to the cutting edges. These blades as at present formed require re-sharpening every few days and have to be removed from the machine for that pur ose.

The 0 ject of the present invention is to obviate the necessity for re-sharpening, that is to say to render the blades self-sharpening in use so that they will retain a keen edge until practically worn out.

The invention consists in deepening the grooves or serrations on the under face adjacent to the cutting edges, as they recede from the edge.

The accompanying drawings illustrate by way of example a knife blade of a mowing machine formed according to the invention. Figure 1 being a view of the under face of the blade, and Fig. 2 an irregular section on AA Fig. 1, the section passing longitudinally through the grooves.

In carrying out the invention according to one mode as in the application to the blade, (1, of an ordinary mowing machine the blade is made of the usual triangular form with the upper faces, I), of the cutting edge beveled. The under face of the blade is flat as usual except near the cutting edges where a num ber of grooves, c, serrations or the like are formed the grooves preferably deepening as they recede from the edges. preferably incline toward the center line of the blade as indicated in Fig. 1. The effect is to give a sickle edge to the blade, and blades so formed mayretain keen edges and remain in use, without necessitating resharpening, until practically worn out.

The invention is not confined to any particular form of groove or serration or to any special method of forming the same, the grooves being formed by stamping, cutting or otherwise as found most convenient.

Having thus described my invention what I claim is new and desire to secure by Letters JAMES SQUAIR.

Witnesses:

ROBERT JAoKsoN, JOHN SHWArrs.

The grooves Y 

